CN1438947A

CN1438947A - Tyre with improved carcass reinforcement anchoring structure

Info

Publication number: CN1438947A
Application number: CN01812006A
Authority: CN
Inventors: Y·埃贝里奥; B·盖里农; P·鲁
Original assignee: Michelin Recherche et Technique SA Switzerland; Societe de Technologie Michelin SAS
Current assignee: Compagnie Generale des Etablissements Michelin SCA
Priority date: 2000-06-29
Filing date: 2001-06-25
Publication date: 2003-08-27
Anticipated expiration: 2021-06-25
Also published as: JP2004501817A; BR0112001A; US7000662B2; CN1211221C; ATE350227T1; DE60125767T2; WO2002000454A1; DE60125767D1; AU2001267566A1; EP1299254B1; EP1299254A1; BR0112001B1; US20030155061A1

Abstract

The invention concerns a tyre comprising a crown, two sidewalls and two beads, a carcass reinforcement anchored in each of the beads and a crown reinforcement, wherein the carcass reinforcement comprises at least two circumferential alignments of first reinforcing elements with high modulus of elasticity, each circumferential alignment of first reinforcing elements being, in each bead, bordered axially inwards and axially outwards by substantially circumferentially oriented second reinforcing elements with modulus of elasticity not less than that of the first reinforcing elements, the first and second reinforcing elements being separated by a layer of a mixture with very high modulus of elasticity and wherein, taking SIGMA RI as the sum of extension rigidities of t he second reinforcing elements arranged axially inwards relative to the carcass reinforcement and taking SIGMA RE as the sum of extension rigidities of the second reinforcing elements arranged axially on either side of the carcass reinforcement, the relationship 0.6 </= SIGMA RI / SIGMA RE </= 1,5 is obtained.

Description

Tire with improved carcass reinforcement anchoring structure

The present invention relates to a kind of tire that is used to bear heavy lift.

Aircraft tyre the time must bear extremity in work, and especially aspect applied load and speed, and its size and weight are lower.The result is, although it has very high inflation pressure, greater than 12 crust, its carrying and the distortion value that may reach are the observed readings that doubles over-loading vehicle tyre or passenger car tire at work.

Speed when taking off reaches about 350 kilometers/hour, therefore has the hot state of very severe.

All these states are disadvantageous to the life-span of tyre edge.

US Patent 4832102 has been described a kind of aircraft tyre, comprise a crown, two side and two tyre beads, one carcass reinforcement and a crown ply reinforcement, wherein this carcass reinforcement has two circumferential alignments that are fixed on the line feeder of two high elastic modulus in the tyre bead, and crown ply reinforcement comprises at least one operation block of at least one high elastic modulus line feeder layer of wire gauze.This carcass reinforcement is fixed in this tyre bead by two circumferential alignments of first line feeder of the high elastic modulus that overturns around a tyre bead steel wire.

Patent application EP0582196 and EP0664232 have provided a kind of novel tire, are used for car tire and that be fixed on the carcass reinforcement of two tyre beads.According to these applications, a tire comprises a tyre bead that is used for fixing this carcass reinforcement, and this reinforcement has basically the line feeder of arranging with ring shaped axial, and it is in abutting connection with the circumferential alignment of this carcass reinforcement line feeder.

Patent application WO98/54006 provides a kind of tire, and its carcass reinforcement comprises two or three line feeder circumferential alignments, and wherein each circumferential alignment is at the line feeder of axially inwards and the basic hoop arrangement of outer edge abuts.This application has related to the line feeder of the looping line feeder of many types.

The present invention relates to a kind of tire, fixedly being enhanced of its carcass reinforcement.

Below, " linear density " is interpreted as the gram weight that refers to a km line feeder.This linear density is with specially for unit.The stress that one line feeder is born or the modulus of this line feeder are unit with " cN/tex ", and cN refers to centinewton (li ox).

" line feeder " is interpreted as any strengthening part of the form that refers to line, and it can be used in strengthens given matrix, for example a rubber block.Line feeder can be described as for example multifilament strand, these strands can self twine or not twine, single line, the individual wire of the big monomer diameter that for example self twines or do not twine, by wringing or stranded these single lines or strand acquisition cable or stranded rope (heart yearn), this line feeder can mix, and in other words, will have the different qualities component set.

" strand " (or " folding strand ") is interpreted as and refers to by stranded two independent strands or a plurality of line feeder that gathers together and constitute, these strands constitute the multifilament strand usually, it is at first stranded separately on a direction (S or Z twist around direction) in first twisting step, twists around together in opposite direction (Z or S twist around direction) in second twisting step then.

" adhesion line feeder " is interpreted as and refers to the line feeder of handling through suitable coating behind heat treatment, bonding this rubber block, and it is scale and the adhesion process of making this line feeder that this coating is handled.

" axially " is interpreted as and refers to the direction that is parallel to this tire axle A; When pointing to tire the inside, this direction is " axially inwards ", and when pointing to the tire outside, this direction is " axially outwards ".

" radially " be interpreted as the direction that refers to perpendicular to this tire axle A and this axis of process, according to pointing to this axis A or tire outside, this direction can be " radially the inside " or " radially outside ".

" basic merry-go-round arrangement " is interpreted as to refer to hoop and departs from the orientation that is no more than 5 degree.

" modulus of elasticity " of rubber size is interpreted as the secant extension modulus that refers at room temperature with 10% elongation strain.

According to tire of the present invention, have a crown, two side and two tyre beads, one is fixed on the carcass reinforcement in each tyre bead and the crown.This tire makes this carcass reinforcement have the circumferential alignment of at least two high elastic modulus first line feeder, the second line feeder axially inwards and axially outwards adjacency that each first-line circumferential alignment is arranged with basic hoop in each tyre bead, the modulus of this second line feeder is more than or equal to the modulus of this first line feeder, and ∑ R ₁Be arranged on the summation of this second line feeder pulling strengrth of this carcass reinforcement axially inwards, and ∑ R _EBe arranged on the summation of this second line feeder pulling strengrth on these axial both sides of carcass reinforcement, and then:

0.6≤∑R _I/∑R _E≤1.5

And best:

0.7≤∑R _I/∑R _E≤1.3

This limit that keeps being arranged on ratio between the summation of summation and this second line feeder pulling strengrth that is arranged on these axial both sides of carcass reinforcement of this second line feeder pulling strengrth of this carcass reinforcement axially inwards in each tyre bead is very important for the more homogeneous stress of this second line feeder of acquisition, no matter and its position in tyre bead.

The embodiment of this tyre bead is specially adapted to the situation of tyre bead base supports at the wheel rim bearing, and the relative tire axle A of its wheel rim bearing tilts a little.For aircraft tyre, heavy-duty vehicle or passenger vehicle, its wheel rim bearing tilts about 5 °.

According to a best features, this tyre bead outside face comprises a pedestal, one frusto-conical wall of the basic radial array of the contiguous cross section wall in the inside radially, this cross-sectional plane is one section arc EF of the circle of center C, and center C is arranged on outside this tyre bead, line CD is through this tyre edge, and the axis of its and this tire constitutes an angle α=+ 45 ± 5 spends, and all second line feeders are arranged on the radial distance of tire axle.This distance is less than or equal to this line CD.This line CD has limited very hard embedding zone that a distortion obviously reduced and one at CD footpath bending area upward.In fact the second all line feeders embeds in the zone at this, has increased the endurance ability of this tyre bead.

This first line feeder preferably has the secant tensile modulus greater than 1000cN/tex, and this line feeder is made of for example aromatic polyamide.

The sizing material layer of this high elastic modulus has the Xiao A hardness greater than 70.This layer also can have greater than 20Mpa, more preferably greater than 30Mpa, 10% the elongation stretching secant extension modulus.

Preferably, have the circumferential alignment of two or three high elastic modulus line feeders, for example circumferential alignment of the line feeder of aromatic polyamide according to the carcass reinforcement of tire of the present invention.

Two circumferential alignments need bear very high mechanical strees, but must be no more than three circumferential alignments for the bending strength of not damaging this sidewall.

Preferably, tyre edge according to the present invention has an outside face, be installed on the wheel rim and after with inflation of tire, be used to make this pedestal outside face to contact with the hook-like part surface of corresponding pedestal and wheel rim, the contact area between this tyre bead outside face and this wheel rim extends to this hook-like part maximum radius R _JSome B.

Preferably, this tyre bead outside face annular diameter is φ, and it is supported in maximum radius R _JWheel rim hook-like part circumference on, and then:

φ＝2(R _J-ε)

ε 0.5 and 2mm between.

This can make this tyre bead good " being located in " on the hook-like part of this bearing and wheel rim, and has the advantage that limits this carcass reinforcement circumferential alignment bending under steam, particularly in contact area.

According to a most preferred embodiment of the present invention, first line feeder of this carcass reinforcement forms the reciprocating path of adjacent arrangement, and on each tyre bead plane, have all connect each time one forward with a loop that returns track.

The features and advantages of the present invention illustrate and understanding better that with embodiment in conjunction with the drawings described embodiment is non-limiting aircraft tyre example, wherein:

-Fig. 1 is that the axle of the aircraft tyre according to the present invention cuts open scheme drawing;

-Fig. 2 schematically describes the transparent view that the line feeder of this carcass reinforcement partly is provided with;

-Fig. 3 has shown the tyre bead of second embodiment.

In Fig. 1, have a crown 2, two side 3 and two tyre beads 4 with the concise and to the point aircraft tyre of describing 1 in semiaxis cross section.One carcass reinforcement 5 extends to another tyre bead from a tyre bead, and is made of two first line feeder circumferential alignments 6 and 7.This first line feeder circumferential alignment 6 and 7 radial arrays in sidewall 3 are made of the aromatic polyamide line feeder, and this first line feeder is arranged in parallel, and are separated by a sizing material layer 8, and the characteristic of this sizing material layer 8 and modulus depend on the position in the tire.

These two circumferential alignments 6 and 7 fixedly are to strengthen alignment or " bundle " 9 guarantees that it is axially disposed within this first line feeder circumferential alignment 6 and 7 each limit by second of merry-go-round arrangement in tyre bead 3.Each second strengthens alignment or restraints 9 can twining a line feeder by spiral and obtaining.At first, first line feeder radially and second line feeder of hoop by one very high-modulus rubber size layer 10 separate each other, be in direct contact with one another to avoid line feeder.This layer 10 has the Xiao A hardness greater than 10, and its 10% secant extension modulus that stretches also can be greater than 20Mpa, more preferably greater than 30Mpa.Result from during this inflation of tire in this first line feeder pulling force by this circumferential alignment 6 and 7 and the cohesive force strengthened between the wire harness 9 of annular bear.This bead structure has guaranteed good fixing, and it can guarantee the very high inflation pressure of aircraft tyre effectively, and this pressure is greater than 12 crust, in specific use even can reach 25 crust.

Second strengthens wire harness 9 is divided into three groups, wherein two bundles 11 are arranged on the axially outwards of the carcass reinforcement 5 in the tire outside, two bundles 13 are arranged on the axially inwards of the carcass reinforcement 5 of tire inboard, and four bundles 12 are arranged between two circumferential alignments 6 and 7 of carcass reinforcement 5.

Second line feeder that is used on this tire is that diameter is steel unit wires or the monofilament lines of 0.98mm, and this line feeder will be coated brass or zinc certainly.Use can realize that this wire harness 9 obtains very large pulling strengrth with very little volume like this.Thus, its price also is lower than the routine assembling of tire.It can also substitute the metal device in known tire field.

For different wire harness 7 obtain homogeneous mechanical stress, the very favorable selection is 0.6≤∑ R _I/ ∑ R _E≤ 1.5,0.7≤∑ R preferably _I/ ∑ R _E≤ 1.3.Under the situation of description tire, be arranged on the number of turns amount of this carcass reinforcement the inside and outside, and then make ∑ R _I/ ∑ R _E≈ 1.24.

It is further noted that this wire harness number of turns reduces gradually with the increase distance of distance tire 1 axis A.The result is a coning formula of this second line feeder basic setup, and its advantage is to enter into contact area with this inflation of tire with in using, and this tyre bead 4 is stable significantly.

The circle of all wire harness 9 all is embedded into one very in the rubber size 10 of high elastic modulus, guaranteeing the absorbing power that produces because of inflation pressure well, and has guaranteed that thus this carcass reinforcement is fixing well in tyre bead 4.

Fig. 2 is the transparent view of the first line feeder circumferential alignment, has wherein only shown the circumferential alignment of this line feeder.The circumferential alignment 6 that can see this first line feeder in the drawings is made of line feeder part 17.In its lower end radially, this line feeder part 17 is formed in ring arranged side by side in the tyre bead 4 18.These encircle 18 adjacent but not overlapping.Circumferential alignment 6 axial both sides at this first line feeder have only shown the wire harness 11 and 12 with these circumferential alignment 6 direct neighbors.For clarity sake, find out the circumferential alignment 6 and two bundles of first line feeder among the figure only, and the circumferential alignment 7 of this first line feeder has the structure of identical line feeder part 17.

Fig. 3 has shown that according to a tyre bead 21 of second embodiment of the invention tire 20 and a sidewall 22, wherein this carcass reinforcement 23 is made of three aromatic polyamide line feeder

circumferential alignments

24,25,26.In tyre bead 21, be provided with the bundle 27 of second line feeder of merry-go-round arrangement.These wire harness 27 are divided into four groups at this.Their axial order from the tyre bead inboard to the outside, three wire harness 28 are arranged on the inboard with respect to the circumferential alignment of this first line feeder 24, four wire harness 29 are arranged between the circumferential alignment of this

first line feeder

24 and 25, three wire harness 30 are arranged between

circumferential alignment

25 and 26, and three wire harness 31 are arranged on the outside with respect to this circumferential alignment 26.

As mentioned above, this second line feeder is steel unit wires or monofilament lines, and total pulling strengrth that its number of turns makes relative this carcass reinforcement be arranged on the wire harness of outside is substantially equal to total pulling strengrth that relative this carcass reinforcement 23 is arranged on the wire harness of the inside.

This tyre bead outside face comprises the frusto-conical wall 33 of the basic radial array of a pedestal 32, the contiguous cross section wall 34 of axially inwards, and its cross section wall 34 is one section arc EF of the circle of C for the center substantially.Center C is arranged on this tyre bead 21 outsides.Constitute an angle α=+ 45 ± 5 degree (this angle is determined) through the line CD of this tyre bead and the axis A of this tire when mounting of tyre is to wheel rim, can notice, all second line feeders 27 are arranged on the radial distance of axis A, and this distance is less than or equal to this line CD.This line CD limits the very little high strength of distortion substantially and embeds zone and one at CD footpath bending area upward.In fact all second line feeders in this embedding zone have all increased the endurance ability of this tyre bead.

The outside face of this tyre bead is used to be supported on the sidewall of this wheel rim 35, and Fig. 3 has also shown the profile of wheel rim.This profile has a bearing 36 and has the sidewall substantially radially of the hook-like part 37 of wheel rim 38.This wheel rim 38 has the circular section shape that the center is C '.The vertex of this radius is a radius R _JSome B.Some E on these tyre bead 21 axial external surface roughly contacts with this B.When this mounting of tyre was to wheel rim, this

surface

34 and 38 was concentric, and center C is identical with C ' in other words.Point E is positioned on the circumference of diameter phi, and its pass is:

φ＝2(R _J-ε)

ε 0.5 and 2mm between.

And B is contacted in free position and its little skew at the some E between the installation site on the wheel rim, is in the state that stretches a little in the time of can making this tyre bead on being installed to wheel rim, and obtains the excellent contact quality.This stability that can strengthen this tyre bead to the contact of some E in tire pressurization and when entering contact area at work.Therefore, can notice, be different from the aircraft tyre of conventional structure, the carcass reinforcement circumferential alignment compressing stress that enters this contact area is very little.

Fig. 1 has also shown the embodiment of a crown ply reinforcement 14.It is to be made of operation block, and this operation block comprises that spiral twines the two row line feeders 15 and 16 of the basic merry-go-round arrangement of at least one line feeder acquisition.This line feeder is made of aromatic polyamide line feeder.The quantity and spacing of this line feeder stratum reticulare is diameter of tyres and running condition and adopt according to the present invention.The embodiment of this crown ply reinforcement can have imitates the advantage that adds hoop, tire vary in diameter minimum under high speed and under the inflation.The change that can notice this shape can be less than 3 to 4 times on the conventional airplane tire of for example 30-7.7R16AIRX.This good hoop effect that adds also has makes the not mobile advantage of sizing material that constitutes this tyre crown tyre surface under height stretches.Because of making the tyre surface cracking, ozone in air is greatly diminished.

Detect 30-7.7R16AIRX diameter tire of the present invention, comprising:

-as 3 first line feeder circumferential alignments of carcass reinforcement, constituting by the gummed strand of linear density 501tex, the gummed strand is made by three identical single strands of 167tex aromatic.The density of first line feeder is 88t/dm in this tyre bead zone;

-as the second line reinforcement, diameter is that the steel monofilament of 0.98mm is divided into 13 wire harness 9:

3 14,17 and 20 circles are at the axial wire harness of the inside,

4 10,14,16 and 20 wire harness between

circumferential alignment

24 and 25 that enclose,

3 19,15 and 10 wire harness between

circumferential alignment

25 and 26 that enclose, and

3 14,10 and 7 the wire harness that enclose at axial ragged edge.

-one crown ply reinforcement has the layer of wire gauze of 3 line feeders of basic merry-go-round arrangement, is made of the gummed strand of linear density 660tex, and the gummed strand is made by 2 identical single strands of 330tex aromatic polyamide, and this line feeder has the layer distance of 1.2mm.

This high elastic modulus sizing material layer has the stretching secant extension modulus and 90 Xiao A hardness of 10% elongation of 45MPa.

The explosion-proof detection that tire stood and maximum pressure detect being about under 100 crust and carry out.Its feature also is the elongation between 1.5% scope of 0 pressure and its operation pressure 15 crust.The detection of taking off of the standard detection when this tire can also actv. stands to be similar to the aircraft tyre checking.

The formation of tire according to the present invention can have good effect to the rigidity heart yearn that forms an inner chamber, and is for example employed in the EP242840 of this reference or EP822047.These heart yearns that use in the final structure needs for all tire part that is set directly at the final position do not bear distortion in any process of the work of manufacturing.This curing occurs on this heart yearn, and the latter is removed after curing.

In forming process, the advantage of this manufacturing step is to have significantly reduced or to have eliminated the prestress on the line feeder, particularly goes up the line of arranging for 0 °.

Band tyre also can partly be cooled off on heart yearn, keeps this line feeder and is in the deformation state that is subjected to laying effect.

Equally, can also as described in WO97/47463 or EP718090, on a molding, make tire, before laying the line feeder of merry-go-round arrangement, provide the moulding of tire building piece.

The line feeder of this merry-go-round arrangement also can lay into a kind of form with a shape, and this shape is same as the shape in curing mold.This crown piece is dressed up complete wheel mole with the known transportation techniques of those skilled in the art subsequently.Then, appoint known principle, this tire is fixed, and pressurize by the film of this tire the inside that is laid in.

This embodiment also guarantees not have to make owing to sulfide stress the prestress of its distortion.

Claims

1, a kind of tire, comprise a crown, two side and two tyre beads, one is fixed on the carcass reinforcement in each tyre bead and the crown, wherein this carcass reinforcement comprises the circumferential alignment of at least two high elastic modulus first line feeder, the second line feeder adjacency that each first-line circumferential alignment is arranged at axially inwards and axially outwards and basic hoop in each tyre bead, the modulus of this second line feeder is more than or equal to the modulus of this first line feeder, this first line feeder and second line feeder are by the very sizing material layer separation of high elastic modulus, wherein, ∑ R ₁Be arranged on the summation of this second line feeder pulling strengrth of this carcass reinforcement axially inwards, and ∑ R _EBe arranged on the summation of this second line feeder pulling strengrth on these axial both sides of carcass reinforcement, and then:

0.6≤∑R _I/∑R _E≤1.5。

2, according to the tire of claim 1,0.7≤∑ R wherein _I/ ∑ R _E≤ 1.3.

3, according to the tire of claim 1 or 2, wherein this tyre bead is supported on relatively this tire axle a little on the bevelled wheel rim bearing.

4, according to the tire of claim 1 to 3, wherein the tyre bead outside face of this tire has a pedestal, one frusto-conical wall of the basic radial array of the contiguous cross section wall in the inside radially, this cross-sectional plane is one section arc EF of the circle of center C, and center C is arranged on this tyre bead axially inwards, and line CD is through this tyre bead, and the axis A of its and this tire constitutes an angle α=+ 45 ± 5 and spends, all second line feeders are arranged on the radial distance of axis A, and this distance is less than or equal to this line CD.

5, according to the tire of claim 1 to 3, wherein this tyre bead has an outside face, be installed on the wheel rim and after with inflation of tire, be used to make this pedestal outside face to contact with the hook-like part surface of corresponding pedestal and wheel rim, the contact area between this tyre bead outside face and this wheel rim extends to maximum radius R _JThe some B of this hook-like part.

6, according to the tire of claim 5, wherein this tyre bead outside face circle diameter is φ, and it is supported in maximum radius R _JWheel rim hook-like part circumference on, and then: φ=2 (R _J-ε)

ε 0.5 and 2mm between.

7, according to the tire of claim 1 to 6, wherein this carcass reinforcement is made of the first line feeder circumferential alignment of maximum three high elastic modulus.

8, according to the tire of claim 1 to 7, wherein first line feeder of this carcass reinforcement forms the reciprocating path of adjacent arrangement, and on each tyre bead plane, have all connect each time one forward with a loop that returns track.

9, according to the tire of claim 1 to 8, wherein the line feeder of high elastic modulus has the secant tensile modulus greater than 1000cN/tex.

10, according to the tire of claim 9, wherein this very the high elastic modulus line feeder constitute by aromatic polyamide.

11, according to the tire of claim 1 to 10, wherein this high elastic modulus sizing material layer has greater than 20MPa, more preferably greater than 30MPa, 10% the elongation stretching secant extension modulus.

12, according to the tire of claim 1 to 11, wherein the sizing material layer of this high elastic modulus has the Xiao A hardness greater than 70.